Compilare: main.cpp: In function 'int main()': main.cpp:49:21: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] if(x==a && y==b) ~^~~ main.cpp:55:12: note: 'b' was declared here int a, b, x, y, n, l, cate; ^ main.cpp:49:13: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] if(x==a && y==b) ~^~~ main.cpp:55:9: note: 'a' was declared here int a, b, x, y, n, l, cate; ^